const fs = require('fs');
let code = fs.readFileSync('src/components/TerminalPanel.vue', 'utf8');

// Convert Touch Events to Pointer Events for manual scroll tracking.
// Since touchmove vanishes but pointermove remains active (with target changing from SPAN to DIV, etc)

// Let's modify pointer_move to handle scrolling

let pointerMoveCode = `    onTouchKeyboardPointerMove = (event: PointerEvent) => {
      // 保持之前的检查，跳除非 touch 事件等
      if (event.pointerType !== "touch" || touchGatePointerId !== event.pointerId) {
        return;
      }
      
      const dx = event.clientX - touchGateStartX;
      const dy = event.clientY - touchGateStartY;
      const absDx = Math.abs(dx);
      const absDy = Math.abs(dy);

      if (absDx > TOUCH_KEYBOARD_TAP_MAX_MOVE_PX || absDy > TOUCH_KEYBOARD_TAP_MAX_MOVE_PX) {
        touchGateMoved = true;
      }
      if (absDy > absDx && absDy > TOUCH_KEYBOARD_TAP_MAX_MOVE_PX) {
        touchGateScrollLike = true;
      }

      // 我们不再拦截 touchmove，改用 pointermove 来计算自己的滚动量
      const hasSelection = hasActiveNativeSelectionInTerminal();
      if (!hasSelection) {
        const now = performance.now();
        const dt = now - touchScrollLastTime;
        const currentY = event.clientY;
        const stepDy = currentY - touchScrollLastY;
        
        // 屏蔽初次的巨大跳跃（手指刚按下时）
        if (dt > 0 && Math.abs(stepDy) < 200 && touchScrollLastTime > 0) {
          if (viewportScroller && stepDy !== 0) {
            viewportScroller.scrollTop -= stepDy;
          }

          const v = (-stepDy / dt) * 16;
          if (touchScrollVelocity * v > 0) {
            touchScrollVelocity = touchScrollVelocity * 0.5 + v * 0.5;
          } else {
            touchScrollVelocity = v;
          }

          const touchMaxSpeed = 120;
          if (touchScrollVelocity > touchMaxSpeed) touchScrollVelocity = touchMaxSpeed;
          else if (touchScrollVelocity < -touchMaxSpeed) touchScrollVelocity = -touchMaxSpeed;
        }

        touchScrollLastY = currentY;
        touchScrollLastTime = now;
      }

      // 由于使用了 pointer，不要无脑阻止原生行为，但我们要阻止 xterm 被选中
      // event.stopImmediatePropagation(); // 我们前面通过 touch-action: none 已经避免了系统层面缩放
    };`;

let pointerDownCode = `    onTouchKeyboardPointerDown = (event: PointerEvent) => {
      console.log("[Scroll Deep] 🟡 POINTER DOWN: ", { pointerId: event.pointerId, type: event.pointerType, target: (event.target as Node)?.nodeName });
      if (event.pointerType !== "touch") {
        return;
      }
      if (!helperTextarea) {
        return;
      }
      touchGatePointerId = event.pointerId;
      touchGateStartX = event.clientX;
      touchGateStartY = event.clientY;
      touchGateMoved = false;
      touchGateScrollLike = false;
      touchGateStartInBand = isTouchInCursorActivationBand(event.clientY);
      touchGateHadSelectionAtStart = hasActiveNativeSelectionInTerminal();

      // == 初始化滚动参数 ==
      clearTouchScrollMomentum();
      touchScrollLastY = event.clientY;
      touchScrollLastTime = performance.now();
      touchScrollVelocity = 0;

      if (DEBUG_TOUCH_FOCUS) {
        console.log("[TouchFocus] pointerdown", {
          inBand: touchGateStartInBand,
          selectionStart: touchGateHadSelectionAtStart,
        });
      }

      event.stopImmediatePropagation();
      if (event.cancelable) {
        event.preventDefault(); 
      }

      helperTextarea.readOnly = true;

      if (sessionStore.state !== "connected") {
        return;
      }
    };`;

let pointerUpCode = `    onTouchKeyboardPointerUp = (event: PointerEvent) => {
      console.log("[Scroll Deep] 🟠 POINTER UP: ", { pointerId: event.pointerId, type: event.pointerType });
      if (event.pointerType !== "touch" || touchGatePointerId !== event.pointerId) {
        return;
      }
      
      // 释放时触发滚行动量
      const threshold = 0.2;
      if (Math.abs(touchScrollVelocity) > threshold && touchGateScrollLike && !hasActiveNativeSelectionInTerminal()) {
        touchScrollVelocity *= 1.35;
        console.log(\`[Scroll Deep] 🚀 Pointer 释放，触发JS惯性，速度=\${touchScrollVelocity.toFixed(2)}\`);
        runTouchScrollMomentum();
      } else {
        console.log(\`[Scroll Deep] 🛑 Pointer 静止释放或非滚动释放\`);
      }
`;

// Now apply pointer changes
code = code.replace(/onTouchKeyboardPointerDown = \(event: PointerEvent\) => \{[\s\S]*?if \(sessionStore\.state \!\=\= "connected"\) \{\n\s*return;\n\s*\}\n\s*\};/m, pointerDownCode);
code = code.replace(/onTouchKeyboardPointerMove = \(event: PointerEvent\) => \{[\s\S]*?event\.stopImmediatePropagation\(\);\n\s*\};/m, pointerMoveCode);
code = code.replace(/onTouchKeyboardPointerUp = \(event: PointerEvent\) => \{[\s\S]*?if \(event\.pointerType \!\=\= "touch" \|\| touchGatePointerId \!\=\= event.pointerId\) \{\n\s*return;\n\s*\}/m, pointerUpCode);

fs.writeFileSync('src/components/TerminalPanel.vue', code);